This selects the transmission interval for CFM lock PDUs once the lock function is active, choosing between one-second and one-minute intervals just as swCFMExtMgmtAISPeriod does for AIS PDUs. It matters for the same reason as its AIS counterpart; the interval affects how quickly a downstream device recognizes the lock condition has been lifted once maintenance finishes, so an admin performing a brief planned maintenance window would want a faster interval to minimize any lag in downstream systems noticing the link is back to normal. A short, tightly-scheduled maintenance window would favor one-second(1) so the lock signal clears promptly and downstream monitoring resumes normal fault detection with minimal delay after the work is done.